scribner



(No Model.) 2 Sheets-Sheet 1.

(J. E. SGRIBNER. ELECTRODE SHIELD FOR ARC LAMPS.

No. 497,898. Patented May 23,1893.

Witnesses Inventur Charles E. Scribner (No Model.) 2 SheetsSheet 2. C. E. SORIBNER.

ELECTRODE SHIELD EOE ARC LAMPS. No. 497,898. Patented May 23, 1893.

Witnesses Eh lguzgzgtugg ar E5 an nsr W 7Z Way UNITED STATES PATENT OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE \VESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRODE-SHIELD FOR ARC LAMPS.

SPECIFICATION forming part of Letters Patent No. 497,898, dated May 23, 1893.

Application filed November 3, 1890. Serial No. 370,138. (No model.)

To all whom it may concern: is maintained in a definite position with re- Be it known that I, CHARLES E. SORIBNER, spect to the arc and the liability of the arc to a citizen of the United States, residing at Chiburn up into the shield to be obscured therecago, in the county of Cook and State of Illiby, or to takea position at a considerable dis- 55 nois, have invented a certain new and useful tance below the shield is avoided.

Improvement in Electrode-Shields for Arc My invention will be readily understood by Lamps, (Case No. 2%,) of which the following reference to the accompanying drawings, in is a full, clear, concise, and exact description, whichreference being had to the accompanying Figure 1 is a side elevation of the opposing 6o :0 drawings, formingapait of this specification. ends of a pair of carbons provided with my I-Ieretofore in focusing lamps the carbons shield supported upon the upper end of the have been fed through openings slightly lower carbon. Fig. 2 is asectional view theresmaller than the carbon electrodes in order of. Fig. 8 is a plan view of the shield. Fig. that the arc might be maintained in a uniform e is a plan view of the lower carbon with the 65 position with respect to the reflector. In this shield support mounted thereon as seen from manner shields have been provided about the line 03-50 of Fig. 1. Figs. 5, 6, 7 and 8 show burning ends of the electrodes; such shields similar views of a modification of my device. in the case of focusing lamps have been of The shield a is preferably in the form of an marble and other material and maintained in inverted pyramid provided with a central 7o a fixed position; incidentally such a shield opening I) so that the end of the upper carbon would act as a heat radiator to protect the carmay be freely inserted therethrough. This hon points from drafts of air and would thus opening is preferably extended by a sleeve 0 tend to prolong the life of the carbons. In to give a sufficient bearing upon the carbon Letters Patent No. l37,90l,granted CharleslV. and act as a radiating medium for the portion I'Iazeltine, October 7,1890, a shield is applied thereof which is heated by the arc. The supnear the are to prevent the rapid consumption port for the shield may consist of a ring at with of the carbons, this shield being fed as the oppoints 6 provided therein and bent inwardly posed ends of the carbons wear away and autoso as to rest upon and be supported by the matically adjusted by the movement of the substance of the lower carbon. I have used 0 carbon rod from which theshield is suspended copper points 6, though I have found points by regulating mechanism consisting of pulleys of iridium preferable since iridium is highly and cords. This regulating mechanism is inrefractory. The points 6 may be of any suittended to maintain the protective tip or shield able substance which will be durable under in the same relative position with reference to the required conditions. 8 3 5 the are at all times, but it is evident that such I preferabiy provide three arms f extending a result can only be obtained approximately u pwardlyfrom the ring d to serve as hearing by the regulating mechanism illustrated and supports for the shield and I preferably prodescribed in said IIazeltine patent. That is to vide insulated bushings g in the shield corresay, the rate of descent of the shield depends spending to the upper ends of the arms f so 40 directly upon the downward movement of the that the bearing between the shield at and the rod and not upon the descent of the arc. support may be insulated. It will be noted The object of my invention is to hold the that these sockets g simply rest upon the up shield in a definite position with respect to the per ends of the arms f so that the shield may are without reference to the movement of the be raised if desired from the support. 9 5 5 carbon rod. This I accomplish by mounting In Figs. 5, 6, 7 and 8 the support is made in the shield upon the upper endof the lower carthe form of a sleeve to completely surround bon in such manner that the disintegration of the upper end of the lower carbon. I do not the lower carbon will gradually remove the consider such a shield for the lower carbon support from the shield, thus permitting the essential, though it is evident it might be ap- 50 shield to descend by graviiy as the lower carplied if under any conditions it should be bon is burned away. In this manner the shield found desirable. My experiments indicate that an open cap composed of wires as shown in Figs. 1, 2 and t is preferable. The insulating sockets 9 may be dispensed with and in lieu thereof the arms may be insulated from the cap by a ring of asbestus or otherwise as shown in Figs. 5 and 6.

The upper shield h is provided simply with holes or plain sockets for the arms 1' which project upwardly from the insulating ring of the lower shield or cap 70.

My invention admits of various modifications as to details of construction and I therefore do not limit myself to the forms of the devices shown.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The combination with the electrodes of an arc lamp placed end to end, of a shield surrounding the lower portion of the upper carbon, said shield being supported by a device suspended upon the lower carbon,wherebythe shield is caused to follow the are as the arc is lowered by the consumption of the carbons, substantially as and for the purpose specified.

2. A cap surrounding the upper end of the lower carbon and provided with hooks bent inwardly to rest upon the substance of the burning end thereof, in combination with arms extending upwardly and a shield through which the lower end of the upper carbon slightly projects resting upon said arms, whereby as the substance of the end of the lower carbon is burned away the shield will be lowered by gravity, substantially as and for the purpose specified.

3. A cap formed of wires 6 bent inwardly, a ring (Z holding said wires in position and arms fextending upwardly from said ring, in com bination with the shield a supported upon said arms and adapted to follow the same as the cap is lowered, the shield and cap being insulated, substantially as and for the purpose specified.

4. The combination with the carbon electrodes of an electric arc lamp, of a cap held suspended from the burning substance of the upper end of the lower carbon, and a cone shaped shield loosely surrounding the lower portion of the upper carbon, said shield being sustained by the cap and insulated therefrom, substantially as and for the purpose specified. In wituesss whereof I hereunto subscribe my name this 30th day of October, A.D. 1890.

CHARLES E. SORIBNER. it-messes:

GEORGE P. BARTON, ELLA EDLER. 

